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Question

A 200 Ω resistor has a certain colour code. If one replaces the red colour by green in the code, the new resistance will be

A
500 Ω
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B
400 Ω
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C
300 Ω
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D
100 Ω
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Solution

The correct option is A 500 Ω
Given, resistance
R=200 Ω=20×101 Ω
So, Colour scheme will be red, black and brown.
Significant figure of red band is 2 and for green is 5 . When red (2) is replaced with green (5), new resistance will be,
R=50×101 Ω=500 Ω
Hence , option (D) is correct.

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